Melting titanium metallizing

Melting Titanium Metallizing

This technology achieves high airtightness and long-term reliability.

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We created our special metallizing technology to utilize the reaction of melted titanium developed independently. It is called "melting titanium metallization technology"

We developed this technology to better join ceramics, nonmetallic materials, and/or metal materials, all of which have poor bonding properties due to their different crystal structures.

To join them airtightly and firmly, we need to metallize the surfaces of ceramics or nonmetallic materials and to generate a bonding between metal materials.
This method of joining the surface of ceramics or nonmetallic materials is called "Metallizin"". This process is significant as how you join metal greatly affects its bondability.

Melted titanium metallization

Materials Use  
Nonmetal Metal
Al2O3 Kovar Ceramic tube for water cooled  
Kovar Power feed through
Vacuum envelopes
SUS304, Ti
Al, Cu
Sapphire SUS304, SUS316, Kovar Ultra-high Vacuum Viewing Port more
AlN・Si3N4 Cu Insulator  
Si・Ge, SiO2, Diamond Kovar, Mo, W Transmission window more

Melting Titanium Technology

Brazing process with ceramic and metal

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The Melting titanium metallization, our unique metallizing technology works as follows:
First, we create metal layers on the surface of ceramics by applying the titanium-based metal paste on the surface of ceramics and processing them in a high-temperature vacuum condition to bring out reactions from the composition of the two.

After the metallization, we conduct the plating process and bond Kovar(an Fe-Ni-Co alloy) and Fe-Ni alloy by brazing (BAg-8 mainly). We guarantee the following: 1.3×10-10Pa·m³/sec in the amount of helium gas leak for the more reliable gas-tight joint.

This metallization method is also different from the “direct brazing method”, which inserts the active metal brazing material between the ceramic and the joining material and then bonds them by one-time heat treatment.


The melting titanium metallization method has the following features.

  1. Stable joining is available regardless of the purity of the alumina.(Joining to Single Crystal Sapphire alumina or 99% alumina is also possible)
  2. Utilizing the active metal reactivity (Ti), we can metallize other materials besides alumina. Please contact us for further information on additional materials to join, including window materials and ceramics.
  3. High corrosion resistance to pure water. While the Mo-Mn method has been accused of causing water leakage issues at the metallized part, we are very proud to say there have been no reported leakage cases of our products for the last decades as our melting titanium metallization technology assures firm joining of materials and high corrosion resistance to pure water.
  4. Energy-effective metallization method. (heat-treating materials in pure water in a vacuum condition at 1,000 °C or below). It is cost-effective compared to the general metallizing method, which conducts heat-treatment at approximately 1,400 °C
  5. It is possible to braze with not only the Fe-Ni-Co alloy or Fe-Ni alloy, but also other materials such as copper and aluminum.

Airtightness and Thermal resistance

Airtightness/Thermal Resistance

Analyzation of joint part

The above two photos show the ceramic distribution of metallizing connections and the titanium distribution of metallizing paste. Overlapping these two photos, you can confirm that titanium firmly and accurately diffuses into the ceramic.

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